Physics-PR

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    Synthesis and electrical characterization of starch based electrolyte system
    (Department of Physics, 2017-03-31) Srivastava, Neelam
    Today's lifestyle (use of too many portable electronic gadgets) demands large amount of energy. Till now the synthetic polymers with lithium salts are being used to develop portable energy devices. It is adding to world’s chemical garbage. Hence for sustainable development it is very important that the constituent materials of energy devices are eco-friendly, low cost and easy to synthesis/handle. Electrolytes prepared in this project are based on starch (abundant in nature, renewable biopolymer, low cost and easy to handle) and sodium salt (cheaper than lithium, abundant in nature) and the preparation methodology is simple and it does not need costly instrumentations. Preliminary testing of the prepared materials for supercapacitor and Microbial fuel cell device fabrication is very encouraging. Hence present proposal has successfully framed the guidelines for future developments of sustainable energy devices
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    Theory of two diensional Molecular Fluids
    (Department of Physics, 2018-07-30) Ram, Jokhan
    Gay-Berne (GR) potential has been proved to be a valuable model with which to investigate the liquid crystals using computer simulation in ll-dimension. In this work we consider the GB model containing the most commonly used values of the four parameters with,various values of length-to-breadth ratios which has not been considered before in 2-dimension.Correlation functions are expanded in complete set ol orthogonal functions.We have considered 16 Body-fixed harmonic coeficients in the expansion of correlation functions and using this we have solved Percus Yevick ( PY ) integral equation combined with Ornstein Zernike equation. The accuracy of the par correlation functions givcn by integral cquation theory has been tested by those obtaincd by NV'I'Montc carlo simulation . Results so obtained have been used in Density Functional Theory (DFT) to study freezing transions.
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    A novel study of nanolayered tunable optical filter based on photonic band gap materials with various applications
    (Department of Physics, 2015-12-31) Srivastava, Sanjay Kumar
    In this work, a highly sensitive surface plasmon resonance (SPR) biosensor with Kretschmann confguration having alternate layers, prism/zinc oxide/silver/gold/graphene/biomolecules (ss-DNA) has been presented. The effect of zinc oxide layer thickness on the sensitivity of SPR biosensor has also been analyzed. From the analysis, it is found that the sensitivity increases significantly by increasing the thickness of zinc oxide layer. The sensitivity of the proposed SPR biosensor has been demonstrated for a number of design parameters such as gold layer thickness, number of graphene layer, refractive index of biomolecules and the thickness of biomolecules layer. SPR biosensor with optimized geometry has greater sensitivity (66 deg/RIU) than the conventional (52 deg/RIU) as well as other graphene based (53.2 deg/RIU) SPR biosensor.
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    Preparation and characterization of nano-composite polymer electrolytes for device applications
    (Department of Physics, 2018-07-30) Gupta, Prem Narain
    Different series of new Polymer electrolytes have been prepared using solution casting technique. Investigation of prepared films have been made using various experimental techniques like X-ray diffraction (XRD), Attenuated total reflection–fourier transform infrared (ATR-FTIR), Thermo-gravimetric analysis (TGA), Differential scanning calorimetric (DSC), AC impedance spectroscopy. AC conductivity spectra, temperature dependent dc conductivity, dielectric properties, electrical modulus and mobility, total number of charge carrier density has been studied.
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    Design and study of surface plasmon resonance based planar waveguide
    (Department of Physics, 2018-07-30) Singh, Vivek
    Theoretical optimization of sensitivity of planar waveguide having chalcogenide material. The basic aim is to design a suitable planar waveguide for higher sensitivity. Fabrication and study of optimized planar waveguide sensor by coating the sensor surface with different bio-selective materials (polymers, antibodies, enzymes etc.) for sensing of microbes. Validation of the developed sensor system through selected non-pathogens bacteria (Pseudomonas aeruginosa) trials and documentation. The aim will be to identify a suitable bio-film for specific binding of selected non-pathogens bacteria.